Wheel cap



FIG. 1 is a perspective view of a wheel cap, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a side view thereof; and,

FIG. 4 is an additional side view thereof.

The broken lines represent portions of the wheel cap that form no part of the claimed design. 

CLAIM The ornamental design for the wheel cap, as shown and described. 